There was talk a while ago about the Prudential Building (the old one) getting some kind of new retail or a plaza atop their ~15th floor setback, as well as a new restaurant on their 40th floor roof.
I haven't heard or seen any movement on that front, but I just noticed that now from the street level you can see some kind of structures have gone up on the lower setback.
Click for big.
The glass railings along the south and southeast corners are new, as far as I know, and there's a little awning thing like you might find at a small bar.
I'm hoping the earlier news wasn't misreported and they aren't only doing a rooftop restaurant at the lower level. A 40th floor rooftop would be amazing at that location.